The time required for the surgery of smoker’s disease is as follows: 1, if you simply do the patching operation, the operation time is short, excluding anesthesia is simply the operation time, only 1-2 hours, the time is determined according to the proficiency of the doctor; if you do the patching with bypass surgery, the operation time is longer, because the bypass, some patients need to take one, some patients need to take two; if you need to take two, the major domestic centers then Skilled surgeons need more than two hours, this operation needs to split the blood vessel and then disconnected and then connected, the operation is a very delicate operation of neurosurgery; 2, in the microscope of the vascular anastomosis, and to find the target vessel, sometimes also delayed, if you take one to two bridges plus the patching surgery, the operation time also need roughly 3-4 hours, sometimes unskilled doctors to 4-5 hours If the surgery is performed by a skilled surgeon, the anesthesia time actually adds up to 3-4 hours or 4-5 hours. The actual bypass time also depends on the condition of the patient’s blood vessels. Some patients have more severe atherosclerosis, and the walls of the blood vessels are more brittle during the bypass, so the operation takes longer and it is difficult to estimate the exact time.